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经营范围
发明名称
摘要
申请公布号
JPS482779(U)
申请公布日期
1973.01.13
申请号
JP19710039808U
申请日期
1971.05.19
申请人
发明人
分类号
G04B39/00;(IPC1-7):G04B39/00
主分类号
G04B39/00
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代理人
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